Ashley is a young, powerful witch and a member of Wario's company WarioWare, Inc.. Ashley is a young witch who lives in a haunted mansion in Diamond City. She often takes trips outside her mansion to train in magic, and frequently thinks about her parents.

Ashley is often seen alongside a small creature named Red. Red is a shapeshifting imp who acts as Ashley's best friend and loyal assistant.

Ashley appears as a new unlockable character in Mario Kart NX, included at the insistence of co-director Goro Abe. She is classified as an "Intermediate" character, weighing the same as Peach and Daisy. Ashley is unlocked by defeating the Staff Ghosts on all courses placed in the Special Cup: Wario City, Abandoned Pipeway, Donkey Kong Cove, Bowser's Castle, and Rainbow Road. Ashley's appearance in Mario Kart NX marks the first appearance of a character from the WarioWare series - aside from Wario - in a Super Mario spin-off sports title.